public void Paint(Graphics g, Rectangle bounds)
{
// Lock the sheet and strokes
using (Synchronizer.Lock(this.m_Sheet.SyncRoot)) {
using (Synchronizer.Lock(this.m_Sheet.Ink.Strokes.SyncRoot)) {
if (this.m_Sheet.Ink.Strokes.Count <= 0)
{
return;
}
// Make a copy of the set of all strokes to be painted.
// The selected strokes will be removed from this and painted separately.
Strokes strokes = this.m_Sheet.Ink.Strokes;
Strokes selection = this.m_Sheet.Selection;
if (selection != null)
{
strokes.Remove(selection);
}
// Create an image using temporary graphics and graphics buffer object
Bitmap imageForPrinting = new Bitmap(bounds.Width, bounds.Height);
using (Graphics graphicsImage = Graphics.FromImage(imageForPrinting))
using (DibGraphicsBuffer dib = new DibGraphicsBuffer()) {
// Create temporary screen Graphics
System.Windows.Forms.Form tempForm = new System.Windows.Forms.Form();
Graphics screenGraphics = tempForm.CreateGraphics();
// Create temporary Graphics from the Device Independent Bitmap
using (Graphics graphicsTemp = dib.RequestBuffer(screenGraphics, bounds.Width, bounds.Height)) {
graphicsTemp.Clear(System.Drawing.Color.Transparent);
// Draw the unselected ink!
// (Ink is not a published property of the InkSheetModel, so no need to obtain a lock.)
this.m_Renderer.Draw(graphicsTemp, strokes);
if (selection != null)
{
// Draw each stroke individually, adjusting its DrawingAttributes.
// TODO: This is very inefficient compared to drawing them all as a group (make a selection of several hundred strokes to see -- a big slow-down).
foreach (Stroke stroke in selection)
{
// It's possible to erase ink while it's selected,
// either with the inverted end of the stylus or via the Undo service.
// But even though the deleted ink won't be part of the main Ink.Strokes collection,
// it won't have been removed from the selection Strokes collection.
// TODO: Being able to delete strokes while they are selected might break more than this.
// Evaluate what needs to change in the eraser and undo service to make this less hacky.
if (stroke.Deleted)
{
continue;
}
// First draw a highlighted background for all the strokes.
DrawingAttributes atts = stroke.DrawingAttributes.Clone();
float width = atts.Width, height = atts.Height;
atts.RasterOperation = RasterOperation.CopyPen;
atts.Color = SystemColors.Highlight;
atts.Width += SELECTED_BORDER_WIDTH__HIMETRIC;
atts.Height += SELECTED_BORDER_WIDTH__HIMETRIC;
this.m_Renderer.Draw(graphicsTemp, stroke, atts);
}
foreach (Stroke stroke in selection)
{
if (stroke.Deleted)
{
continue;
}
// Second, draw the stroke itself, but with a contrastive color.
DrawingAttributes atts = stroke.DrawingAttributes.Clone();
atts.RasterOperation = RasterOperation.CopyPen;
atts.Color = SystemColors.HighlightText;
this.m_Renderer.Draw(graphicsTemp, stroke, atts);
}
}
// Use the buffer to paint onto the final image
dib.PaintBuffer(graphicsImage, 0, 0);
// Draw this image onto the printer graphics,
// adjusting for printer margins
g.DrawImage(imageForPrinting, bounds.Top, bounds.Left);
}
}
}
}
}
